A buildreq of perl(LWP::RobotUA) has recently been added to perl-WWW-RobotRules, and this causes a build dependency cycle between perl-libwww-perl and perl-WWW-RobotRules. Having looked at the WWW-RobotRules distribution, I believe that nothing there actually uses LWP::RobotUA (the only references seem to be in examples - t/misc/dbmrobot is more example code than test) and indeed a build without perl-libwww-perl in the buildroot passes without complaint. So please remove this redundant buildreq to resolve the build dependency cycle.
You are right. The file is never being executed so I have removed all of its dependencies.